[Mimedefang] Re: md_check_against_smtp_server

[Damrose, Mark]

> -----Original Message-----
> From: Daniel Aquino

> I notice that "IIS + Exchange" are constantly responding with 
> a "2.1.5 ok rcpt"
> Anyone know if they can be setup to return failure codes for 
> bad recipients ?

I understand that Exchange 2003 and above can, anything older
can not.  

Google found this:
http://mxtoolbox.com/cs/blogs/mxwatch/archive/2007/04/03/exchange-and-nd
r-spam.aspx
I have not tried it myself, so I can't vouch for its accuracy.